JP5807703B2 - Developer cartridge - Google Patents

Description

  The present invention relates to a developing cartridge that is detachably mounted in an apparatus main body of an image forming apparatus such as a laser printer.

  An image forming apparatus such as a laser printer includes a type in which a developing cartridge is detachably mounted in the apparatus main body. The developing cartridge contains toner. When the toner in the developing cartridge runs out, the developing cartridge is taken out from the apparatus main body. Then, a new developing cartridge is mounted in the apparatus main body. Further, when a paper jam occurs in the apparatus main body, the developing cartridge may be taken out from the apparatus main body, and after the jam is resolved, the developing cartridge may be mounted in the apparatus main body again.

  In this type of image forming apparatus, when a detection gear having a contact protrusion is disposed on a side surface of the developing cartridge and the developing cartridge is mounted in the apparatus main body, information on the developing cartridge is based on the rotation of the detecting gear. Something to get is proposed.

  The detection gear is provided to be rotatable around an axis extending in a direction orthogonal to the side surface of the developing cartridge. Gear teeth are formed on the peripheral surface of the detection gear except for a part thereof. That is, the detection gear is a chipped gear. In addition, a transmission gear is provided on the side surface of the developing cartridge so as to be rotatable about an axis extending parallel to the axis of the detection gear. Gear teeth are formed on the circumferential surface of the transmission gear over the entire circumference. When the developing cartridge is new, the gear teeth of the transmission gear are engaged with the gear teeth of the detection gear. When a new developing cartridge is mounted in the apparatus main body and the driving force of the motor is input to the transmission gear, the driving force is transmitted from the transmission gear to the detection gear via the gear teeth.

  As a result, the detection gear rotates, and the contact protrusion moves as the detection gear rotates. A sensor for detecting the passage of the contact protrusion is provided in the apparatus main body. Then, it is determined whether the developing cartridge is a new product or an old product based on whether or not the passage of the contact protrusion is detected by the sensor within a certain time from the start of driving of the motor. When the rotation of the detection gear advances and the missing tooth portion of the detection gear faces the gear teeth of the transmission gear, the meshing between the gear teeth of the transmission gear and the gear teeth of the detection gear is released, and the rotation of the detection gear stops.

JP 2006-267994 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a developing cartridge that is more convenient than conventional ones while including a detected rotating body such as a detection gear.

In order to achieve the above-described object, the present invention provides a developing cartridge that is detachably mounted in a main body of an image forming apparatus, and includes a first side wall and a second side wall that are arranged to face each other. Provided inside the apparatus main body is a housing that accommodates a developer therein, and is provided outside the first side wall so as to be rotatable about a first axis that extends in the opposing direction of the first side wall and the second side wall. And a second member extending between the first side wall and the second side wall in parallel with a space between the first side wall and the second side wall. A developing roller that is rotatable about two axes and rotates by a driving force received by the passive member, and a third axis that extends outside the first side wall and extends in parallel with the first axis at a distance. The device book is rotatably provided A development portion having a detection portion that is a detection target of a detection member provided in the inside, and a contact portion that is disposed with a space in the rotation direction about the third axis with respect to the detection portion; In the process of mounting the cartridge in the apparatus main body, the contact portion comes into contact with an interference member fixedly arranged in the apparatus main body, so that it can be rotated by the driving force received by the passive member from the retracted position. And a detected rotating body that rotates to an initial position.

  According to the present invention, the passive member and the detected rotating body are rotatably provided around the first axis and the third axis on the outside of the first side wall of the housing. A developing roller is provided between the first side wall and the second side wall so as to be rotatable about a second axis extending parallel to the first axis.

  A driving output member provided in the apparatus main body is connected to the passive member, and driving force is input from the driving output member. The developing roller is rotated by the driving force input to the passive member (the driving force received by the passive member from the drive output member).

  The detected rotating body has a detected portion and a contact portion. The contact portion contacts an interference member fixedly disposed in the apparatus main body in the process of mounting the developing cartridge in the apparatus main body. Thereby, the detected rotating body rotates from the retracted position to the initial position, and can be rotated by the driving force received by the passive member.

  Before the developing cartridge is mounted in the apparatus main body, the rotational position of the detected rotating body is the retracted position, and the detected rotating body is separated from the passive member by the driving force received by the passive member. Does not rotate.

  For example, in the developing cartridge manufacturing line, the operation of the developing cartridge may be checked after the developing cartridge is assembled. To confirm the operation, a driving force is input to the passive member. As a result, the detected rotating body rotates and the detected part moves. Based on the detection result of the detected part by the detection member, the developing cartridge may be determined to be an old product.

  When the rotational position of the detected rotating body is the retracted position, even if a driving force is input to the passive member, the detected rotating body does not rotate. The operation of the developing cartridge can be confirmed. Therefore, even if the operation of the developing cartridge is checked, whether the developing cartridge is new or old based on the detection result of the detected part by the detecting member after the developing cartridge is mounted in the apparatus main body. For example, information regarding the developing cartridge can be acquired favorably.

  Therefore, the developing cartridge according to the present invention is more convenient than the conventional developing cartridge while including the detected rotating body.

In addition, since the detected part and the contact part are formed separately, the wear of the detected part and the positional accuracy of the detected part and the contact part are compared with the structure in which these parts are formed as the same part. Is excellent. That is, if the detected portion also serves as the contact portion, the detected portion may be worn due to contact with the interference member in the apparatus main body. In addition, the arrangement of the parts to be detected and the contact part can be determined separately so that the functions of the parts of the part to be detected and the contact part can be satisfactorily satisfied, and the part to be detected and the contact part can be accurately arranged at the determined positions. .

FIG. 1 is a sectional view of a laser printer equipped with a developing cartridge according to an embodiment of the present invention. FIG. 2A is a perspective view of the developing cartridge as viewed from the left rear. 2B is a left side view of the developing cartridge shown in FIG. 2A and shows a state where a gear cover is attached. 2C is a left side view of the developing cartridge shown in FIG. 2A. FIG. 2D is a left side view of the developing cartridge shown in FIG. 2A and shows a state where a part of the detected rotating body is missing. FIG. 2E is a perspective view of a part of the developing cartridge shown in FIG. 2A, and shows a part thereof in an enlarged manner. FIG. 3A is a perspective view of the developing cartridge as viewed from the left rear, and shows a state immediately after being mounted in the main body casing. FIG. 3B is a left side view of the developing cartridge shown in FIG. 3A and shows a state where a gear cover is attached. 3C is a left side view of the developing cartridge shown in FIG. 3A. FIG. 3D is a left side view of the developing cartridge shown in FIG. 3A and shows a state where a part of the detected rotating body is missing. 4A is a perspective view of the developing cartridge as viewed from the left rear side, and shows a state next to the state shown in FIG. 3A. FIG. 4B is a left side view of the developing cartridge shown in FIG. 4A and shows a state where a gear cover is attached. 4C is a left side view of the developing cartridge shown in FIG. 4A. FIG. 4D is a left side view of the developing cartridge shown in FIG. 4A and shows a state in which a part of the detected rotating body is missing. FIG. 5A is a perspective view of the developing cartridge as viewed from the left rear side, and shows a state next to the state shown in FIG. 4A. FIG. 5B is a left side view of the developing cartridge shown in FIG. 5A and shows a state where a gear cover is attached. FIG. 5C is a left side view of the developing cartridge shown in FIG. 5A. FIG. 5D is a left side view of the developing cartridge shown in FIG. 5A and shows a state in which a part of the detected rotating body is missing. 6A is a perspective view of the developing cartridge as viewed from the left rear side, and shows a state next to the state shown in FIG. 5A. FIG. 6B is a left side view of the developing cartridge shown in FIG. 6A and shows a state where a gear cover is attached. 6C is a left side view of the developing cartridge shown in FIG. 6A. FIG. 6D is a left side view of the developing cartridge shown in FIG. 67A and shows a state in which a part of the detected rotating body is missing. FIG. 7A is a perspective view of the developing cartridge as seen from the left rear side, and shows a state next to the state shown in FIG. 6A. FIG. 7B is a left side view of the developing cartridge shown in FIG. 7A and shows a state where a gear cover is attached. FIG. 7C is a left side view of the developing cartridge shown in FIG. 7A. FIG. 7D is a left side view of the developing cartridge shown in FIG. 7A and shows a state in which a part of the detected rotating body is missing. FIG. 7E is a perspective view of a part of the developing cartridge shown in FIG. 7A, and shows an enlarged part thereof. FIG. 8A is a perspective view of the developing cartridge as viewed from the left rear side, and shows a state next to the state shown in FIG. 7A. FIG. 8B is a left side view of the developing cartridge shown in FIG. 8A and shows a state where a gear cover is attached. FIG. 8C is a left side view of the developing cartridge shown in FIG. 8A. FIG. 8D is a left side view of the developing cartridge shown in FIG. 8A and shows a state in which a part of the detected rotating body is missing. FIG. 9A is a perspective view of the developing cartridge as viewed from the left rear side, and shows a state next to the state shown in FIG. 8A. FIG. 9B is a left side view of the developing cartridge shown in FIG. 9A and shows a state where a gear cover is attached. FIG. 9C is a left side view of the developing cartridge shown in FIG. 9A. FIG. 9D is a left side view of the developing cartridge shown in FIG. 9A and shows a state in which a part of the detected rotating body is missing. FIG. 10A is a perspective view of the developing cartridge as viewed from the left rear side, and shows a state next to the state shown in FIG. 9A. FIG. 10B is a left side view of the developing cartridge shown in FIG. 10A and shows a state where a gear cover is attached. FIG. 10C is a left side view of the developing cartridge shown in FIG. 10A. FIG. 10D is a left side view of the developing cartridge shown in FIG. 10A and shows a state in which a part of the detected rotating body is missing. FIG. 11A is a perspective view of the developing cartridge as viewed from the left rear side, and shows a state next to the state shown in FIG. 10A. FIG. 11B is a left side view of the developing cartridge shown in FIG. 11A and shows a state where a gear cover is attached. FIG. 11C is a left side view of the developing cartridge shown in FIG. 11A. FIG. 11D is a left side view of the developing cartridge shown in FIG. 11A and shows a state where a part of the detected rotating body is missing. FIG. 12 is a timing chart showing the operation timing of the main part at the time of detecting the mounting of the developing cartridge and detecting the new article. FIG. 13 is a timing chart showing other operation timings of main parts (timing in a configuration in which the third detection unit is omitted) at the time of detecting the mounting of the developing cartridge and detecting the new article. FIG. 14 is a plan view showing a configuration (Modification 1) in which the engaging portion is formed separately from the agitator gear. FIG. 15 is an illustrative side view showing a configuration (Modification 2) in which the engaging portion is formed integrally with an agitator gear and another gear. FIG. 16 is a side view showing a configuration (Modification 3) in which the first detected portion and the second detected portion are integrated. FIG. 17 is a schematic side view showing a configuration (Modification 4) instead of the chipped gear portion of the detected rotating body. FIG. 18 is an example of a flowchart for detecting the mounting of a developing cartridge and detecting a new product (an example of determining whether a developing cartridge is mounted before driving a motor). FIG. 19 is another example of the flowchart for detecting the mounting of the developing cartridge and detecting the new article (an example in which the presence or absence of the mounting of the developing cartridge is determined after the motor is driven).

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1. As shown in FIG. 1, a laser printer 1 as an example of an image forming apparatus includes a main body casing 2 as an example of an apparatus main body. A cartridge attaching / detaching port 3 is formed on one side wall of the main body casing 2, and a front cover 4 for opening and closing the cartridge attaching / detaching port 3 is provided.

  In the following description, the side on which the front cover 4 is provided is the front side of the laser printer 1. With respect to the top, bottom, left and right of the laser printer 1, the laser printer 1 is viewed from the front side. Further, the front and rear of the developing cartridge 7 to be described later are based on the state where the developing cartridge 7 is mounted, and the upper, lower, left and right are based on the time when the developing cartridge 7 is viewed from the front side.

  A process cartridge 5 is mounted at a position slightly ahead of the center in the main casing 2. The process cartridge 5 is mounted in the main body casing 2 via the cartridge attaching / detaching port 3 with the front cover 4 opened, and is detached from the main body casing 2.

  The process cartridge 5 includes a drum cartridge 6 and a developing cartridge 7 that is detachably attached to the drum cartridge 6.

  The drum cartridge 6 includes a drum frame 8. A photosensitive drum 9 is rotatably held at the rear end of the drum frame 8. The drum frame 8 holds a charger 10 and a transfer roller 11. The charger 10 and the transfer roller 11 are disposed behind and below the photosensitive drum 9, respectively.

  A portion of the drum frame 8 in front of the photosensitive drum 9 is a developing cartridge mounting portion 12, and the developing cartridge 7 is mounted on the developing cartridge mounting portion 12.

  The developing cartridge 7 includes a housing 13 that accommodates toner. Inside the housing 13, a toner storage chamber 14 and a developing chamber 15 that are in communication with each other are formed adjacent to each other in the front-rear direction.

  An agitator 16 is provided in the toner storage chamber 14 so as to be rotatable about an agitator rotation axis 17 extending in the left-right direction. As the agitator 16 rotates, the toner stored in the toner storage chamber 14 is agitated and sent from the toner storage chamber 14 to the developing chamber 15.

  A developing roller 18 and a supply roller 19 are provided in the developing chamber 15 so as to be rotatable about a developing rotation axis 20 and a supply rotation axis 21 extending in the left-right direction, respectively. The developing roller 18 is disposed so that a part of the peripheral surface thereof is exposed from the rear end portion of the housing 13. The developing cartridge 7 is mounted on the drum cartridge 6 so that the peripheral surface of the developing roller 18 is in contact with the peripheral surface of the photosensitive drum 9. The supply roller 19 is arranged so that the peripheral surface thereof is in contact with the peripheral surface of the developing roller 18 from the front lower side. The toner in the developing chamber 15 is supplied to the peripheral surface of the developing roller 18 by the supply roller 19 and is carried as a thin layer on the peripheral surface of the developing roller 18.

  In the main casing 2, an exposure unit 22 including a laser is disposed above the process cartridge 5.

At the time of image formation, the photosensitive drum 9 is rotated at a constant speed clockwise in FIG. As the photosensitive drum 9 rotates, the peripheral surface (surface) of the photosensitive drum 9 is uniformly charged by the discharge from the charger 10. On the other hand, a laser beam is emitted from the exposure device 22 based on image data received from a personal computer (not shown) connected to the printer 1. The laser beam passes between the charger 10 and the developing cartridge 7 and is irradiated onto the circumferential surface of the uniformly positively charged photosensitive drum 9 to selectively expose the circumferential surface of the photosensitive drum 9. As a result, charges are selectively removed from the exposed portion of the photosensitive drum 9, and an electrostatic latent image is formed on the peripheral surface of the photosensitive drum 9. When the electrostatic latent image faces the developing roller 18 by the rotation of the photosensitive drum 9, toner is supplied from the developing roller 18 to the electrostatic latent image. As a result, a toner image is formed on the peripheral surface of the photosensitive drum 9.

  A paper feed cassette 23 that accommodates the paper P is disposed at the bottom of the main casing 2. Above the paper feed cassette 23, a pickup roller 24 for feeding paper from the paper feed cassette 23 is provided.

  Further, a conveyance path 25 having an S-shape in side view is formed in the main body casing 2. The conveyance path 25 reaches from the paper feed cassette 23 to the paper discharge tray 26 formed on the upper surface of the main body casing 2 via the space between the photosensitive drum 9 and the transfer roller 11. A separation roller 27 and a separation pad 28, a pair of paper feed rollers 29, a pair of registration rollers 30, and a pair of paper discharge rollers 31 are provided on the transport path 25 so as to face each other.

  The paper P sent out from the paper feed cassette 23 passes between the separation roller 27 and the separation pad 28, and at that time, is fed one by one. Thereafter, the paper P is conveyed toward the registration roller 30 by the paper supply roller 29. Then, after the registration by the registration roller 30, the sheet P is conveyed by the registration roller 30 toward the photosensitive drum 9 and the transfer roller 11.

  The toner image on the circumferential surface of the photosensitive drum 9 is electrically attracted by the transfer roller 11 when the photosensitive drum 9 rotates and faces the paper P passing between the photosensitive drum 9 and the transfer roller 11. And transferred to the paper P.

  On the conveyance path 25, a fixing device 32 is provided on the downstream side in the conveyance direction of the paper P with respect to the transfer roller 11. The paper P on which the toner image has been transferred is transported through the transport path 25 and passes through the fixing device 32. In the fixing device 32, the toner image becomes an image and is fixed on the paper P by heating and pressing.

  The printer 1 has, as operation modes, a single-side mode in which an image (toner image) is formed on one side of the paper P, and an image formed on one side of the paper P and then on the other side opposite to the one side of the paper P. And a duplex mode for forming an image.

  In the single-sided mode, the paper P on which an image is formed on one side is discharged to the paper discharge tray 26 by the paper discharge roller 31.

  As a configuration for realizing the double-sided mode, a reverse conveyance path 33 is formed in the main body casing 2. The reverse conveyance path 33 extends from the vicinity of the paper discharge roller 31 between the conveyance path 25 and the paper feed cassette 23, and is connected to a portion of the conveyance path 25 between the paper feed roller 29 and the registration roller 30. On the reverse conveyance path 33, a pair of first reverse conveyance rollers 34 and a pair of second reverse conveyance rollers 35 are provided.

In the duplex mode, after an image is formed on one side of the paper P, the paper P is sent to the reverse conveyance path 33 without being discharged to the paper discharge tray 26. Then, the sheet P is transported through the reverse transport path 33 by the first reverse transport roller 34 and the second reverse transport roller 35, the front and back are reversed, and the other surface on which the image is not formed is the periphery of the photosensitive drum 9. It is fed into the conveyance path 25 in a posture facing the surface. Then, an image is formed on both sides of the paper P by forming an image on the other side of the paper P.
2. Developing Cartridge (1) Housing As shown in FIG. 2A, the housing 13 of the developing cartridge 7 is formed in a box shape with the rear side opened. Specifically, the housing 13 includes a first side wall 41 and a second side wall 42. The 1st side wall 41 and the 2nd side wall 42 have comprised the plate shape which mutually opposes in the left-right direction and each extends in the front-back direction. The housing 13 includes an upper wall 43 constructed between the upper ends of the first side wall 41 and the second side wall, and a lower wall 44 constructed between the lower ends of the first side wall 41 and the second side wall. It has. The front end portion of the lower wall 44 extends upward while being curved, and is connected to the front end portion of the upper wall 43.
(2) Gear On the outer side (left side) of the left first side wall 41, as shown in FIGS. 2A and 2C, an input gear 45, a developing gear 46, a supply gear 47, an intermediate gear 48, which are examples of passive members, An agitator gear 49 and a detected rotating body 50 are provided as an example of an intermediate rotating body.
(2-1) Input Gear The input gear 45 is disposed at the upper rear end of the first side wall 41. The input gear 45 is provided to be rotatable about an input gear rotation shaft 51 extending in the left-right direction. The input gear rotation shaft 51 is held on the first side wall 41 so as not to rotate.

  The input gear 45 integrally includes a large-diameter gear portion 52, a small-diameter gear portion 53, and a coupling portion 54. The large diameter gear portion 52, the small diameter gear portion 53, and the coupling portion 54 are arranged in this order from the first side wall 41 side.

  The large-diameter gear portion 52 is formed in a disc shape whose center axis coincides with the input gear rotation shaft 51. Gear teeth (for example, inclined teeth) are formed on the circumferential surface of the large-diameter gear portion 52 over the entire circumference.

  The small-diameter gear portion 53 has a disk shape whose center axis coincides with the input gear rotation shaft 51 and has a smaller diameter than the large-diameter gear portion 52. Gear teeth (for example, inclined teeth) are formed on the circumferential surface of the small-diameter gear portion 53 over the entire circumference.

  The coupling portion 54 has a cylindrical shape whose center axis coincides with the input gear rotation shaft 51, and has a peripheral surface having a smaller diameter than the peripheral surface of the small diameter gear portion 53. A coupling recess 55 is formed on the left side surface of the coupling portion 54. In a state where the developing cartridge 7 is mounted in the main body casing 2, the front end portion of the drive output member 56 (see FIG. 2A) provided in the main body casing 2 is inserted into the coupling recess 55.

The drive output member 56 is provided so as to be able to advance and retract in the left-right direction. With the developing cartridge 7 mounted in the main casing 2, the drive output member 56 advances to the right along the central axis of the input gear rotation shaft 51, and its tip is inserted into the coupling recess 55. As a result, the drive output member 56 and the coupling recess 55 are coupled so as not to be relatively rotatable. Therefore, when the drive output member 56 is rotated by the drive force from the motor (not shown) in the main body casing 2, the rotational force of the drive output member 56 is received as the drive force by the input gear 45, and the drive output The input gear 45 rotates together with the member 56.
(2-2) Developing Gear The developing gear 46 is disposed below the input gear 45. The developing gear 46 is attached to a developing roller shaft 57 of the developing roller 18 so as not to be relatively rotatable. The developing roller shaft 57 is provided so as to be rotatable with respect to the first side wall 41, and the central axis thereof is the developing roller 18.
The rotation axis 20 is a developing rotation axis 20 (see FIG. 1) as an example of the second axis. On the peripheral surface of the developing gear 46, gear teeth are formed over the entire circumference, and the gear teeth mesh with the gear teeth of the large-diameter gear portion 52 of the input gear 45.
(2-3) Supply Gear The supply gear 47 is disposed below the input gear 45. The supply gear 47 is attached to a supply roller shaft 58 of the supply roller 19 (see FIG. 1) so as not to be relatively rotatable. The supply roller shaft 58 is provided so as to be rotatable with respect to the first side wall 41, and the central axis thereof is the supply rotation axis 21 (see FIG. 1) that is the rotation axis of the supply roller 19. Gear teeth are formed on the peripheral surface of the supply gear 47 over the entire circumference, and these gear teeth mesh with the gear teeth of the small-diameter gear portion 53 of the input gear 45.
(2-4) Intermediate Gear The intermediate gear 48 is disposed in front of the input gear 45. The intermediate gear 48 is provided to be rotatable about an intermediate gear rotation shaft 59 extending in the left-right direction. The intermediate gear rotation shaft 59 is held on the first side wall 41 so as not to rotate.

  The intermediate gear 48 integrally has a small-diameter portion 60 formed in a disc shape having a relatively small outer diameter and a large-diameter portion 61 formed in a cylindrical shape having a relatively large outer diameter. Have. The small diameter part 60 and the large diameter part 61 are arranged in this order from the first side wall 41 side. The central axes of the small diameter part 60 and the large diameter part 61 coincide with the central axis of the intermediate gear rotation shaft 59.

  Gear teeth are formed on the circumferential surface of the small diameter portion 60 over the entire circumference.

Gear teeth are formed on the circumferential surface of the large-diameter portion 61 over the entire circumference. The gear teeth of the large diameter portion 61 mesh with the gear teeth of the small diameter gear portion 53 of the input gear 45.
(2-5) Agitator Gear The agitator gear 49 is disposed on the front lower side of the intermediate gear 48. As shown in FIG. 2C, the agitator gear 49 is attached to the agitator rotating shaft 62 so as not to be relatively rotatable. Specifically, the agitator rotating shaft 62 penetrates the first side wall 41 in the left-right direction. In the housing 13, the agitator 16 is attached to the agitator rotating shaft 62. The left end portion of the agitator rotating shaft 62 is D-cut processed into a D-shape in a side view with a part of its peripheral surface cut off. Then, on the outside of the first side wall 41, the left end portion of the agitator rotating shaft 62 is inserted into a shaft insertion hole 63 having a D-shape in side view formed by penetrating the agitator gear 49 in the left-right direction. 49 is attached to the agitator rotating shaft 62 so as not to be relatively rotatable.

  The agitator rotating shaft 62 is rotatably held by the first side wall 41 and the second side wall 42 (see FIG. 2A). Thereby, the agitator 16 and the agitator gear 49 can rotate integrally with the agitator rotating shaft 62 with the central axis of the agitator rotating shaft 62 as the agitator rotating axis 17 (see FIG. 1).

  Further, the agitator gear 49 has a large-diameter gear portion 64, a small-diameter gear portion 65, and an engaging portion 66 integrally.

  The large-diameter gear portion 64 has a disc shape whose center axis coincides with the agitator rotation shaft 62. Gear teeth are formed on the circumferential surface of the large-diameter gear portion 64 over the entire circumference. The gear teeth of the large diameter gear portion 64 mesh with the gear teeth of the small diameter portion 60 of the intermediate gear 48.

The small diameter gear portion 65 is formed on the opposite side to the first side wall 41 with respect to the large diameter gear portion 64, has a disk shape whose center axis coincides with the agitator rotation shaft 62, and has a smaller diameter than the large diameter gear portion 64. Is formed. Gear teeth 67 as an example of first gear teeth are formed on the circumferential surface of the small-diameter gear portion 65 over the entire circumference.

The engaging portion 66 is provided on the left end surface of the small diameter gear portion 65. The engaging portion 66 has a height in the left-right direction and has a substantially triangular shape in side view extending in the radial direction of the small-diameter gear portion 65. The end of the engaging portion 66 opposite to the agitator rotating shaft 62 side is formed in the same shape as one gear tooth 67 of the small-diameter gear portion 65 in a side view, and completely exceeds one gear tooth 67 in the left-right direction. Wrapping.
(2-6) Detected Rotating Body The detected rotating body 50 is disposed in front of the agitator gear 49. As shown in FIGS. 2A to 2D, the detected rotating body 50 is provided to be rotatable around a rotating shaft 68 that extends in the left-right direction. The rotating shaft 68 is held on the first side wall 41 so as not to rotate.

  And the to-be-detected rotating body 50 includes a chipped gear portion 69, a raised portion 70, a cylindrical portion 71, a first detected portion 72 as an example of a detected portion, a second detected portion 73 as an example of a contact portion, and The third detected portion 74 is integrally provided.

  As shown in FIG. 2D, the chipped gear portion 69 has a double cylindrical shape in which the rotation axis 68 and the center axis coincide with each other.

  Gear teeth 76 as an example of the second gear teeth are formed on a part of the outer peripheral surface of the cylindrical portion, that is, the outermost peripheral surface of the chipped gear portion 69. Specifically, on the outermost peripheral surface of the missing tooth gear portion 69, a portion having a central angle of about 230 ° is defined as a missing tooth portion 77, and a portion other than the missing tooth portion 77 has a central angle of about 130 °. The gear teeth 76 are formed. The gear teeth 76 have a larger tooth width than the gear teeth 67 of the small-diameter gear portion 65 of the agitator gear 49, and the right end surface thereof is disposed on the same plane as the right end surface of the gear teeth 67. Thus, the left end portion of the gear tooth 76 does not mesh with the gear tooth 67 regardless of the rotational position of the detected rotating body 50, and the portion other than the left end portion of the gear tooth 76 is the rotational position of the detected rotating body 50. Depending on the gear teeth 67.

  Further, in the missing tooth portion 77, an engaged portion 78 is formed at the upstream end portion in the rotation direction of the detected rotating body 50 (counterclockwise in FIG. 2D). As shown in FIG. 2E, the engaged portion 78 has a triangular shape in a side view extending in the radial direction of the detected rotating body at substantially the same length as the height of the gear teeth 76, and the gear teeth 76 rotate in the dentition. It faces the left end portion of the gear tooth 76 disposed at the most downstream end in the direction with an interval in the rotational direction. Here, the engaged portion 78 is the right end portion of the gear tooth 76 disposed at the most downstream end in the rotational direction of the tooth row of the gear tooth 76 (specifically, the left end that does not mesh with the gear tooth 67 of the gear tooth 76). It does not oppose the part (the part on the right side from the above) in the rotation direction. Thus, the engaged portion 78 does not contact the gear teeth 67 of the small diameter gear portion 65 of the agitator gear 49 regardless of the rotational position of the detected rotating body 50. The rotation locus drawn by the engaged portion 78 when the detected rotating body 50 rotates partially overlaps the rotation locus drawn by the engaging portion 66 when the agitator gear 49 rotates.

  A pressed portion 79 is formed integrally with a cylindrical portion inside the chipped gear portion 69. The pressed portion 79 includes a first radially extending portion 80 extending in the radial direction from the peripheral surface of the inner cylindrical portion, and a rotational direction of the detected rotating body 50 from the tip portion of the first radially extending portion 80. A rotating direction extending portion 81 extending in the rotating direction toward the downstream side and a second radial extending portion 82 extending from the tip end portion of the rotating direction extending portion 81 toward the peripheral surface of the cylindrical portion are provided. doing. The first radially extending portion 80 is in a direction substantially perpendicular to a line segment connecting the gear tooth 76 disposed on the most downstream side of the gear teeth 76 and the rotating shaft 68 (specifically, the line segment Extending in an angle of about 85 ° with respect to the angle. Further, the rotation direction extending portion 81 is formed along an arc whose central angle about the central axis of the rotation shaft 68 is about 80 °, and faces the chipped portion 77.

  The raised portion 70 is formed in a cylindrical shape whose center axis coincides with the rotation shaft 68. A through hole (not shown) is formed in the raised portion 70 along its central axis, and the rotary shaft 68 is inserted through the through hole.

  The cylindrical portion 71 has a cylindrical shape protruding from the left end surface of the raised portion 70. The left end portion of the rotation shaft 68 is inserted into the cylindrical portion 71.

  The first detected portion 72 extends from the cylindrical portion 71 in the radial direction of the raised portion 70 on the left end surface of the raised portion 70. In the rotational direction of the detected rotating body 50, the distal end portion of the first detected portion 72 is disposed at substantially the same position as the central portion of the tooth row of the gear teeth 76 of the chipped gear portion 69.

  The second detected portion 73 extends on the left end surface of the raised portion 70 from the cylindrical portion 71 in a direction almost opposite to the first detected portion 72. In the rotational direction of the detected rotating body 50, the distal end portion 73 </ b> A of the second detected portion 73 is disposed at substantially the same position as the center portion of the missing tooth portion 77 of the missing tooth gear portion 69. Further, the distal end portion 73A protrudes outside the rotation locus drawn by the first detected portion 72 when the detected rotating body 50 rotates, and forms a contacted portion with which an interference member 91 described later contacts.

The third detected portion 74 is provided upstream of the first detected portion 72 and downstream of the second detected portion 73 in the rotation direction of the detected rotating body 50 (counterclockwise in FIG. 2B). It extends in a direction orthogonal to the direction in which the first detected portion 72 extends and the direction in which the second detected portion 73 extends. (3) Wire Spring As shown in FIG. 2D, a cylindrical boss 83 is formed on the outside of the first side wall 41 so as to protrude in front of the detected rotating body 50. A wire spring 84 as an example of a holding member is wound around the boss 83. One end of the wire spring 84 is fixed to the first side wall 41. The other end portion of the wire spring 84 extends toward the rotating shaft 68 of the detected rotating body 50, the middle portion thereof is bent, and its tip portion abuts against the pressed portion 79 of the chipped gear portion 69 from the front side. The pressing part 79 is pressed backward.
(4) Gear Cover As shown in FIG. 2B, a gear cover 85 is attached to the outside of the first side wall 41. The gear cover 85 collectively covers the input gear 45, the supply gear 47, the intermediate gear 48, the agitator gear 49, the detected rotating body 50 and the wire spring 84. The gear cover 85 has an opening 86 for exposing the coupling portion 54 of the input gear 45, a raised portion 70 of the detected rotating body 50, a cylindrical portion 71, a first detected portion 72, and a second detected portion 73. And the opening 87 for exposing the 3rd to-be-detected part 74 is formed.
3. Interference member In the main casing 2, as shown in FIG. 3A, interference occurs at a position facing the first side wall 41 of the developing cartridge 7 in the left-right direction and facing the second detected portion 73 in the up-down direction. A member 91 is provided. The interference member 91 has a thickness in the up-down direction, extends in the front-rear direction, and has a plate-like support portion 92 extending from the middle portion in the front-rear direction on the upper surface of the support portion 92 to be inclined rearward and bent, A support portion 92 and a plate-like operation portion 93 that further extends rearward at an interval are provided.
4). Detection Mechanism Further, as shown in FIGS. 3A to 3C, a detection mechanism for detecting the first detected part 72, the second detected part 72, and the third detected part 74 is provided in the main body casing 2. It has been. This detection mechanism includes an actuator 94 and an optical sensor 95 as an example of a detection member.

The actuator 94 is spaced to the left with respect to a portion where the swinging shaft 96 extending in the left-right direction, a contact lever 97 extending downward from the right end of the swinging shaft 96, and the contact lever 97 of the swinging shaft 96 are coupled. A light shielding lever 98 extending upward from the portion where the space is left is integrally provided. The swing shaft 96 is rotatably held on, for example, an inner wall portion (not shown) of the main body casing 2. The contact lever 97 and the light shielding lever 98 intersect each other at an angle of about 130 ° with the swing shaft 96 as the center.

  As shown in FIG. 3C, the actuator 94 has a detection posture in which the contact lever 97 extends substantially vertically downward from the swing shaft 96 and the light shielding lever 98 extends forward and upward from the swing shaft 96. As shown in the drawing, the light shielding lever 98 extends substantially vertically upward from the swing shaft 96, and the contact lever 97 can swing to a non-detection posture extending from the swing shaft 96 to the front and lower. The force is biased so that the detected posture is obtained in a state where no external force other than the spring force is applied.

The optical sensor 95 includes a light emitting element and a light receiving element that are disposed to face each other in the left-right direction. The optical sensor 95 is disposed at a position where the optical path from the light emitting element to the light receiving element is blocked by the light shielding lever 98 of the actuator 94 in the detection posture. The optical sensor 95 outputs an ON signal while the light path from the light emitting element to the light receiving element is blocked by the light shielding lever 98, and while the light path is not blocked (light from the light emitting element reaches the light receiving element). During this period, an off signal is output.
5. As shown in FIGS. 2A to 2C, in the new developer cartridge 7, the second detected portion 73 extends vertically downward from the cylindrical portion 71. Further, as shown in FIG. 2D, in the new developing cartridge 7, the engaged portion 78 is positioned outside the rotation locus drawn by the engaging portion 66 when the agitator gear 49 rotates, specifically, in a side view. The small-diameter gear portion 65 of the agitator gear 49 is disposed at a position facing the upper end portion in the front-rear direction.

  Note that the rotational position of the detected rotating body 50 at this time is an example of a retracted position.

  The developing cartridge 7 is mounted in the main casing 2 while the front cover 7 is opened. When a new developing cartridge 7 is mounted in the main casing 2, the tip end portion 73 </ b> A of the second detected portion 73 becomes the operating portion 93 of the interference member 91 as shown in FIGS. It contacts the upper surface of the inclined portion. Then, due to the backward movement of the developing cartridge 7 accompanying the mounting, the tip end portion 73A of the second detected portion 73 is lifted upward according to the inclination while rubbing the upper surface of the inclined portion of the operation portion 93. . As a result, the detected rotating body 50 rotates about 10 ° in the clockwise direction in FIGS. 3B to 3D (T1-T2 in FIG. 12), and as shown in FIG. Arranged on the rotation trajectory.

  When the mounting of the developing cartridge 7 is completed, as shown in FIGS. 3A to 3C, the tip end portion of the first detected portion 72 comes into contact with the lower end portion of the contact lever 97 of the actuator 94, and the lower end portion is moved backward. By pressing, the actuator 94 becomes the detection posture. As a result, the optical path from the light emitting element to the light receiving element of the optical sensor 95 is blocked by the light shielding lever 98, and an ON signal is output from the optical sensor 95 (T1 in FIG. 12). Thereby, the indirect detection of the 1st to-be-detected part 72 by the optical sensor 95 is achieved.

  The rotational position of the detected rotating body 50 at this time is an example of the initial position at which the first detected unit 72 is detected by the optical sensor 95.

When the mounting of the developing cartridge 7 is completed and the front cover 4 is closed, the warm-up operation of the laser printer 1 is started. In this warm-up operation, the drive output member 56 (see FIG. 2A) is inserted into the coupling recess 55 of the input gear 45, the drive force is input from the drive output member 56 to the input gear 45, and the input gear 45 rotates. As the input gear 45 rotates, the developing gear 46, the supply gear 47, and the intermediate gear 48 rotate, and the developing roller 18 and the supply roller 19 rotate. As the intermediate gear 48 rotates, the agitator gear 49 rotates (T3 in FIG. 12), and the agitator 16 (see FIG. 1) rotates. The rotation of the agitator 16 loosens the toner in the developing cartridge 7.

  The agitator gear 49 rotates clockwise in FIGS. 4C, 5C, and 6C so that the rotational positions thereof are sequentially shown in FIGS. 4C, 5C, and 6C. At this time, the engaging portion 66 and the engaged portion 78 are not in contact with each other, and the gear tooth 76 of the chipped gear portion 69 of the agitator gear 49 and the gear tooth 67 of the agitator gear 49 are not meshed with each other. Therefore, as shown in FIGS. 4A to 4D, 5A to 5D, and 6A to 6D, the detected rotating body 50 does not rotate, and the rotational position of the detected rotating body 50 does not change.

  When the rotation of the agitator gear 49 proceeds, the engaging portion 66 contacts the engaged portion 78 as shown in FIGS. 7A, 7C, and 7D. Specifically, as shown in FIG. 7E, the engaging portion 66 contacts the engaged portion 78 from above.

  When the rotation of the agitator gear 49 further proceeds, as shown in FIGS. 8A, 8C, and 8D, the engaged portion 78 is pressed by the engaging portion 66, and the detected rotating body 50 is moved to FIGS. 8A, 8C, and 8D. (T4 in FIG. 12), the gear teeth 76 of the chipped gear portion 69 of the detected rotating body 50 mesh with the gear teeth 67 of the agitator gear 49.

  Thereafter, following the rotation of the agitator gear 49, the gear teeth 76 move, and the detected rotating body 50 rotates. 9A to 9C, the tip of the first detected portion 72 is separated from the contact lever 97 of the actuator 94, and the actuator 94 changes from the detection posture to the non-detection posture. . As a result, the light shielding lever 98 is removed from the optical path from the light emitting element to the light receiving element of the optical sensor 95, and an off signal is output from the optical sensor 95 (T5 in FIG. 12).

  Thereafter, when the rotation of the agitator gear 49 and the detected rotating body 50 proceeds, the tip end portion of the third detected portion 74 comes into contact with the lower end portion of the contact lever 97 of the actuator 94 as shown in FIGS. The lower end of the actuator 94 is pushed rearward, and the actuator 94 changes from the non-detection posture to the detection posture again. As a result, the optical path from the light emitting element to the light receiving element of the optical sensor 95 is blocked by the light shielding lever 98, and an ON signal is output from the optical sensor 95 (T6 in FIG. 12). Thereby, the indirect detection of the 3rd to-be-detected part 74 by the optical sensor 95 is achieved.

  When the rotation of the agitator gear 49 and the detected rotating body 50 further proceeds, the tip end portion of the third detected portion 74 moves away from the contact lever 97 of the actuator 94, and the actuator 94 changes from the detection posture to the non-detection posture again. As a result, the light shielding lever 98 is removed from the optical path from the light emitting element to the light receiving element of the optical sensor 95, and an off signal is output from the optical sensor 95 (T7 in FIG. 12).

  Thereafter, when the rotation of the agitator gear 49 and the detected rotating body 50 further proceeds, as shown in FIGS. 11A to 11C, the distal end portion 73A of the second detected portion 73 becomes the lower end portion of the contact lever 97 of the actuator 94. , The lower end of the actuator 94 is pressed backward, and the actuator 94 changes from the non-detection posture to the detection posture again. As a result, the optical path from the light emitting element to the light receiving element of the optical sensor 95 is blocked by the light shielding lever 98, and an ON signal is output from the optical sensor 95 (T8 in FIG. 12). Thereby, the indirect detection of the 2nd to-be-detected part 73 by the optical sensor 95 is achieved.

Then, as shown in FIG. 11D, when the rotation of the agitator gear 49 and the detected rotating body 50 further proceeds and the meshing of the gear teeth 76 of the detected rotating body 50 with the gear teeth 67 of the agitator gear 49 is released. Then, the rotation of the detected rotating body 50 stops (T9 in FIG. 12). Thereafter, the wire spring 84 presses the pressed portion 79 of the detected rotating body 50 toward the rear, so that the rotational position of the detected rotating body 50 is disengaged from the gear teeth 76 and the gear teeth 67. The detected rotation body 50 is not rotated by being held at the rotation position at the time.

  When a certain period of time has elapsed after the front cover 7 is closed, the warm-up operation is terminated, the motor (not shown) that rotates the drive output member 56 is stopped, and driving from the drive output member 56 to the input gear 45 is performed. Force input stops.

  As described above, when a new developing cartridge 7 is first attached to the main casing 2, a state where an off signal is output from the optical sensor 95 occurs twice. Therefore, when the state where the OFF signal is output from the optical sensor 95 occurs twice after the developing cartridge 2 is mounted on the main casing 2, it can be determined that the developing cartridge 2 is new.

  Further, when the developing cartridge 7 is new, when the developing cartridge 7 is mounted in the main casing 2, the tip of the first detected portion 72 moves the lower end of the contact lever 97 of the actuator 94 backward. The actuator 94 is in a detection posture, and an ON signal is output from the optical sensor 95. Even if the developing cartridge 7 is an old product, when the developing cartridge 7 is mounted in the main casing 2, the distal end portion 73 </ b> A of the second detected portion 73 moves the lower end portion of the contact lever 97 of the actuator 94 backward. The actuator 94 is in a detection posture, and an ON signal is output from the optical sensor 95. Therefore, regardless of whether the developing cartridge 7 is a new product or an old product, an ON signal is output from the optical sensor 95 when the developing cartridge 7 is mounted in the main casing 2. It can be determined whether or not the developing cartridge 7 is mounted in the main casing 2.

  Note that the third detected portion 74 may be omitted. When the third detected portion 74 is omitted, when a new developing cartridge 2 is mounted on the main casing 2, an on signal is not output from the optical sensor 95 at time T <b> 6-T <b> 7, as shown in FIG. 13. A state in which an off signal is output from the optical sensor 95 occurs only once. Therefore, it can be determined that the developing cartridge 2 is new when the state in which the off signal is output from the optical sensor 95 occurs once.

  For example, a relatively large amount of toner is accommodated in the housing 13 of the developing cartridge 2 in which the third detected portion 74 is provided, and the housing of the developing cartridge 2 in which the third detected portion 74 is omitted. 13 contains a relatively small amount of toner, and when these are selectively mounted in the main casing 2, an off signal is output from the optical sensor 95 after the new developing cartridge 2 is mounted. The type of the developing cartridge 7 can be determined based on the number of occurrences of the developed state.

  Whether the developing cartridge 7 is mounted or not and whether the developing cartridge 7 is new or old is determined by a control unit (not shown) including a microcomputer. Specifically, for example, the processing shown in the flowchart of FIG. 18 is executed by the control unit in order to determine whether or not the developing cartridge 7 is mounted and whether the developing cartridge 7 is new or old.

  The flowchart of FIG. 18 is executed in response to the front cover 7 being closed.

  When the front cover 7 is closed, it is first checked whether or not the output signal of the optical sensor 95 is an ON signal (ON) (S1).

  If the output signal of the optical sensor 95 is an ON signal (S1: YES), the warm-up operation is started and the drive output member 56 is rotated in a state where the drive output member 56 is coupled to the coupling recess 55 of the input gear 45. The driving of a motor (not shown) is started (S2).

  While the motor is being driven, the state of the output signal of the optical sensor 95 is constantly monitored (S3). That is, the control unit samples the output signal of the optical sensor 95 at a constant cycle, and repeatedly checks whether the output signal of the optical sensor 95 is an on signal or an off signal. Each time the output signal of the optical sensor 95 is switched from the on signal to the off signal, the value of the counter in the control unit is incremented (+1). The counter value is reset to zero at the start of this process.

  When a certain time has elapsed from the start of motor driving (S4: YES), the motor driving is stopped and the warm-up operation ends.

  Then, it is checked whether or not an off signal is output from the optical sensor 95 during the period in which the motor is driven (monitoring period) (S5). Specifically, it is checked whether the value of the counter in the control unit is 1 or 2 or zero.

  If the value of the counter is 1 or 2, it is determined that the developing cartridge 7 is new (S6). In a more detailed example, if the counter value is 1, it is determined that the developing cartridge 7 is new and contains a relatively small amount of toner, and if the counter value is 2, the developing cartridge 7 Is new and contains a relatively large amount of toner.

  On the other hand, if the value of the counter is zero, it is determined that the developing cartridge 7 is an old product (S7).

If the output signal of the optical sensor 95 immediately after the front cover 7 is closed is an off signal (S1: NO), it is determined that the developing cartridge 7 is not mounted in the main casing 2 (S8).
6). Function and Effect (1) Function and Effect 1
As described above, on the outside of the first side wall 41 of the housing 13, the input gear 45 and the detected rotating body 50 can rotate around the central axes of the input gear rotating shaft 51 and the rotating shaft 68 extending in parallel with each other. Is provided. The center axes of the input gear rotation shaft 51 and the rotation shaft 68 are examples of the first axis and the third axis, respectively. Further, the developing roller 18 is provided between the first side wall 41 and the second side wall 42 so as to be rotatable about the developing rotation axis 20.

  A drive output member 56 provided in the main casing 2 is connected to the input gear 45, and a drive force is input from the drive output member 56. The developing roller 18 is rotated by the driving force input to the input gear 45 (the driving force received by the input gear 45 from the drive output member 56).

  The detected rotating body 50 includes a first detected unit 72 and a second detected unit 73. The second detected portion 73 contacts the interference member 91 that is fixedly disposed in the main casing 2 in the process in which the developing cartridge 7 is mounted in the main casing 2. Accordingly, the detected rotating body 50 rotates from the retracted position that is the rotational position shown in FIGS. 2A to 2D to the initial position that is the rotational position shown in FIGS. As a result, the detected rotating body 50 can be rotated by the driving force from the input gear 45 (the engaging portion 66 can contact the engaged portion 78).

  Before the developing cartridge 7 is mounted in the main casing 2, the rotational position of the detected rotating body 50 is the retracted position, and the detected rotating body 50 is disconnected from the input gear 45 and the input gear 45 is driven. It does not rotate due to the driving force that 45 receives.

  In the production line of the developing cartridge 7, the operation of the developing cartridge 7 may be confirmed after the assembling of the developing cartridge 7. When a driving force is input to the input gear 45 to check this operation, and the detected rotating body 50 rotates as a result, the rotational position of the detected rotating body 50 deviates from an appropriate position. May be acquired. For example, when the detected rotating body 50 is rotated to a rotational position exceeding the rotational position shown in FIGS. 11B and 11C when the operation of the developing cartridge 7 is confirmed, it is determined whether the developing cartridge 7 is a new product or an old product. Even impossible. That is, even if it is a new developing cartridge 7, when it is mounted in the main body casing 2, an off signal is not output from the optical sensor 95, and it is determined that the developing cartridge 7 is an old product. There is a fear.

  When the rotational position of the detected rotating body 50 is the retracted position, the detected rotating body 50 does not rotate even if a driving force is input to the input gear 45. The operation of the developing cartridge 7 can be confirmed without rotating. Therefore, even if the operation of the developing cartridge 7 is confirmed, the detected rotating body 50 does not rotate to an unintended position. Therefore, even after the operation is confirmed, the first detected portion 72, the second detected portion 73, and the third detected portion 74 of the detected rotating body 50 are maintained at appropriate positions. Therefore, after the developing cartridge 7 is mounted in the main casing 2, the first detected portion 72 can be detected by the optical sensor 95, and based on this information (information regarding the mounting of the developing cartridge 7). Presence / absence) can be acquired well.

  Therefore, the developing cartridge 7 is more convenient than the conventional developing cartridge while including the detected rotating body 50.

  Further, since the first detected part 72 and the second detected part 73 are formed separately, the wear of the first detected part 72 and the first are compared with the configuration in which these parts are formed as the same part. It is excellent in terms of positional accuracy of the detected part 72 and the second detected part 73.

  That is, if the first detected part 72 also serves as the second detected part 73, the first detected part 72 may be worn by contact with the interference member 91 in the main body casing 2. When the first detected part 72 is worn, the contact state between the first detected part 72 and the contact lever 97 of the actuator 94 becomes unstable, and the detection accuracy of the first detected part 72 by the optical sensor 95 decreases. There is a fear. If the first detected portion 72 and the second detected portion 73 are formed separately, the first detected portion 72 due to contact with the interference member 91 is not worn, so the first detected by the optical sensor 95 is detected. Good detection of the part 72 can be achieved.

Further, the arrangement of the first detected unit 72 and the second detected unit 73 is determined individually so that the functions of the first detected unit 72 and the second detected unit 73 are performed well. 73 can be accurately placed at each determined position. As a result, good detection of the first detected portion 72 by the optical sensor 95 and good contact between the second detected portion 73 and the interference member 91 can be achieved.
(2) Action effect 2
An agitator gear 49 is provided outside the first side wall 41 so as to be rotatable about a central axis of an agitator rotation shaft 62 as an example of a fourth axis, a fifth axis, and a sixth axis. The agitator gear 49 is rotated by the driving force received by the input gear 45. An engaging portion 66 is formed in the agitator gear 49.

  On the other hand, the detected rotating body 50 has an engaged portion 78. The engaged portion 78 is provided so that the rotation locus drawn when the detected rotating body 50 rotates partially overlaps the rotation locus drawn by the engaging portion 66.

  When the rotation position of the detected rotating body 50 is the retracted position, the engaged portion 78 is disposed outside the rotation locus of the engaging portion 66. Therefore, even if the agitator gear 49 (engaging portion 66) rotates in this state, the engaging portion 66 does not engage with the engaged portion 78. When the detected rotating body 50 rotates from the retracted position to the initial position, the engaged portion 78 is disposed on the rotation locus of the engaging portion 66. When the agitator gear 49 rotates in this state, the engaging portion 66 engages with the engaged portion 78, and force is applied from the engaging portion 66 to the engaged portion 78, so that the detected rotating body 50 rotates. To do.

Therefore, with the simple configuration including the engaging portion 66 and the engaged portion 78, when the rotational position of the detected rotating body 50 is the retracted position, the detected rotating body 50 is surely received by the driving force received by the input gear 45. Can be in a non-rotating state. When the detected rotating body 50 is rotated from the retracted position to the initial position, the detected rotating body 50 can be reliably rotated by the driving force received by the input gear 45.
(3) Effect 3
Gear teeth 67 are formed on the peripheral surface of the small diameter gear portion 65 of the agitator gear 49.

  On the other hand, on the peripheral surface of the missing tooth gear portion 69 of the detected rotating body 50, a gear tooth 76 that can mesh with the gear tooth 67 is formed in a portion other than the missing tooth portion 77 as a part of the missing tooth portion 77. ing.

When the rotational position of the detected rotating body 50 is the retracted position and the initial position, the missing tooth portion 77 of the detected rotating body 50 faces the gear teeth 67 of the agitator gear 49. Therefore, when the rotational position of the detected rotating body 50 is the retracted position and the initial position, even if the agitator gear 49 is rotated by the driving force received by the input gear 45, the gear teeth 76 of the detected rotating body 50 are immediately used. Does not mesh with the gear teeth 67 of the agitator gear 49. Therefore, when the rotational position of the detected rotating body 50 is the retracted position and the initial position, it is possible to prevent the detected rotating body 50 from being immediately driven by the rotation of the agitator gear 49 and rotating.
(4) Action effect 4
The developing cartridge 7 is provided with an agitator 16. Therefore, the toner contained in the housing 13 can be agitated by the agitator 16.

  In the new developing cartridge 7, the toner in the housing 13 may be hardened. In this case, immediately after the new developing cartridge 7 is mounted in the main casing 2 and the agitator gear 49 starts to rotate by the driving force received by the input gear 45 from the driving output member 56, the developing cartridge 7 rotates integrally with the agitator gear 49. A large load (resistance) is applied to the agitator 16 to be operated. When the toner starts to loosen, the load applied to the agitator 16 becomes small, and the magnitude of the load settles almost constant. Accordingly, the rotation of the agitator gear 49 becomes unstable after the agitator gear 49 starts rotating until the toner is loosened.

  The detected rotating body 50 does not follow the rotation of the agitator gear 49 immediately after the drive output member 56 is started (immediately after the drive force input to the input gear 45 is started). After the time required for engaging the engaged portion 78, the rotation of the agitator gear 49 is followed. Therefore, the detected rotating body 50 can be driven by the rotation of the agitator gear 49 after the toner in the casing is loosened. As a result, the rotation of the detected rotating body 50 can be further stabilized, and the first detected portion 72 can be moved at a more stable speed.

Even if the toner in the housing 13 is not solidified, the magnitude of the driving force input from the driving output member 56 to the input gear 45 is unstable immediately after the driving output member 56 is started. Therefore, after the time required from when the drive output member 56 is started until the engaging portion 66 is engaged with the engaged portion 78 has elapsed, the detected rotating body 50 starts to rotate, so that the detected rotating body 50 is moved. It can be rotated by a driving force having a stable magnitude, and the first detected portion 72 can be moved at a more stable speed.
(5) Action effect 5
The first detected portion 72 and the second detected portion 73 extend in the rotational radius direction of the detected rotating body 50. The second detected portion 73 protrudes out of the rotation locus drawn by the first detected portion 72 when the detected rotating body 50 rotates, and the protruding tip 73A is when the developing cartridge 7 is mounted in the main casing 2. It is set as the to-be-contacted part which the interference member 91 contacts. Thereby, while the interference member 91 can be reliably brought into contact with the second detected portion 73, the first detected portion 72 can be prevented from coming into contact with the interference member 91 when the detected rotating body 50 is rotated. .
(6) Action effect 6
Further, since the first detected unit 72 and the second detected unit 73 are arranged away from each other in the rotation direction of the detected rotating body 50, even if the detected rotating body 50 does not rotate 360 °, The rotational position is shifted from the initial position where the first detected portion 72 is detected by the optical sensor 95 to the position where the second detected portion 73 is detected by the optical sensor 95. For this reason, since the detected rotating body 50 includes the chipped gear portion 69, when the detected rotating body 50 rotates to a position where the second detected portion 73 is detected by the optical sensor 95, the agitator gear 49 detects the detected rotating body 50. While the transmission of the driving force to the detection rotating body 50 can be interrupted, the first detected portion 72 and the second detected portion 73 are provided, so that the detected rotating body 50 is rotated without rotating 360 °. Detection of the first detected part 72 and the second detected part 73 by the sensor 95 can be achieved.

  For example, the second detected portion 73 is omitted, and it is determined whether or not the developing cartridge 7 is new by only detecting the first detected portion 72 by the optical sensor 95, and the developing cartridge 7 is in the main casing 2. It is conceivable to perform both of the determination as to whether or not it is attached to the camera.

  In this case, when a new developing cartridge 7 is mounted in the main casing 2, the first detected portion 72 comes into contact with the contact lever 97 of the actuator 94, and the first detected portion 72 is detected by the optical sensor 95. Need to be done. Then, after the first detected portion 72 is once separated from the contact lever 97 by the rotation of the detected rotating body 50, the detected rotating body 50 rotates 360 ° from the time when the developing cartridge 7 is mounted, and the first detected section 72 is rotated. The detection unit 72 needs to contact the contact lever 97 again, and the first detected unit 72 needs to be detected by the optical sensor 95. Furthermore, transmission of the driving force from the agitator gear 49 to the detected rotating body 50 must be interrupted when the detected rotating body 50 rotates 360 °.

  These three requirements cannot be satisfied by the configuration including the chipped gear portion 69, and in order to satisfy these requirements, a complicated mechanism such as a clutch mechanism must be provided, and the developing cartridge 7 (laser printer) The structure of 1) becomes complicated and the cost increases.

Since the second detected portion 73 is provided separately from the first detected portion 72 and the chipped gear portion 69 is provided, the configuration of the developing cartridge 7 and the increase in cost can be suppressed, while the developing cartridge 7 can be reduced. It is possible to satisfy three requirements for favorably discriminating whether the developing cartridge 7 is installed in the new / old product and the main casing 2.
7). Modification (1) Modification 1
In the laser printer 1, the engaging portion 66 is integrally formed with the small diameter gear portion 65 of the agitator gear 49. However, as shown in FIG. 14, for example, a cylindrical coupling member 141 is provided as a separate member from the small-diameter gear portion 65, and the engaging portion 66 is formed on the coupling member 141 so as to protrude from the peripheral surface. The coupling member 141 may be coupled to the small-diameter gear portion 65 so as to be integrally rotatable (non-relatively rotatable).

In this case, as shown in FIG. 14, the small-diameter gear portion 65 and the coupling member 141 include, for example, a recess 143 provided in the small-diameter gear portion 65 with two bosses 142 extending toward the small-diameter gear portion 65 in the coupling member 141. It is possible to rotate as a whole by fitting together.
(2) Modification 2
Further, as shown in FIG. 15, the engaging portion 66 is formed on another gear 151 to which the driving force is transmitted from the intermediate gear 48 so that its tip protrudes from the peripheral surface of the gear 151, and the rotation of the gear 151. The engaged portion 78 may be pressed by the above. In this case, the detected rotating body 50 first drives the chipped gear portion 69 from the small-diameter gear portion 65 of the agitator 49 by contacting the engaging portion 66 and the engaged portion 78 provided on the gear 151. It will rotate to the receiving position.
(3) Modification 3
The first detected unit 72 and the second detected unit 73 may be integrated. For example, as shown in FIG. 16, the outer periphery of the cylindrical portion 71 is between the first detected portion 72 and the third detected portion 74 and between the third detected portion 74 and the second detected portion 73, respectively. The connection parts 161 and 162 as an example of the non-detection part extending along the surface may be formed, and the first detection part 72, the second detection part 73, and the third detection part 74 may be integrated. .

In this case, the contact lever 97 of the actuator 94 may be in contact with the connecting portions 161 and 162 while the detection rotating body 50 rotates. In such a configuration, the height of the connecting portions 161 and 162 (the length in the rotational radius direction of the detected rotating body 50) is smaller than the length of the first detected portion 72 and the second detected portion 73, Even if the contact lever 97 of the actuator 94 contacts the connecting portions 161 and 162, the light shielding lever 98 of the actuator 94 is formed so as not to deviate from the optical path of the optical sensor 95.
(4) Modification 4
In the laser printer 1, the detected rotating body 50 is provided with a chipped gear portion 69, and gear teeth 76 are formed on the outermost peripheral surface of the chipped gear portion 69. However, instead of the cylindrical portion outside the chipped gear portion 69, for example, as shown in FIG. 17, a fan-shaped plate-shaped main body 171 centering on the rotation shaft 68 of the detected rotating body 50, and at least the outer peripheral surface There may be provided a resistance imparting member 173 formed of a material having a relatively large friction coefficient such as rubber and wound around the outer periphery of the wall portion 172 erected along the peripheral edge of the main body 171. In this case, gear teeth 67 may be formed on the peripheral surface of the small-diameter gear portion 65 of the agitator gear 49 or the gear teeth 67 may not be formed. The main body 171 and the resistance applying member 173 have an angle formed by two planes on the outer peripheral surface of the resistance applying member 173 of about 230 °, and these planes do not come into contact with the small-diameter gear portion 65. The surface is formed in a size such that the peripheral surface of the small-diameter gear portion 65 is in contact with the peripheral surface of the small-diameter gear portion 65.
(5) Modification 5
In order to determine whether or not the developing cartridge 7 is attached and whether the developing cartridge 7 is new or old, the control unit executes the process shown in the flowchart of FIG. 19 instead of the process shown in the flowchart of FIG.

  The flowchart of FIG. 19 is executed in response to the front cover 7 being closed.

  When the front cover 7 is closed, a warm-up operation is started and a motor (not shown) is driven to rotate the drive output member 56 in a state where the drive output member 56 is coupled to the coupling recess 55 of the input gear 45. Is started (S11).

While the motor is being driven, the state of the output signal of the optical sensor 95 is constantly monitored (S12).
That is, the control unit samples the output signal of the optical sensor 95 at a constant cycle, and repeatedly checks whether the output signal of the optical sensor 95 is an on signal or an off signal. Each time the output signal of the optical sensor 95 is switched from the on signal to the off signal, the value of the counter in the control unit is incremented (+1). The counter value is reset to zero at the start of this process.

  When a certain time has elapsed from the start of motor driving (S13: YES), the motor driving is stopped and the warm-up operation ends.

  Thereafter, it is checked whether or not the output signal of the optical sensor 95 is an ON signal (ON) (S14).

  If the output signal of the optical sensor 95 is an ON signal (S14: YES), the presence / absence of an output of an OFF signal from the optical sensor 95 during the period during which the motor is driven (monitoring period) is checked (S15). . Specifically, it is checked whether the value of the counter in the control unit is 1 or 2 or zero.

  If the value of the counter is 1 or 2, it is determined that the developing cartridge 7 is new (S16). In a more detailed example, if the counter value is 1, it is determined that the developing cartridge 7 is new and contains a relatively small amount of toner, and if the counter value is 2, the developing cartridge 7 Is new and contains a relatively large amount of toner.

  On the other hand, if the value of the counter is zero, it is determined that the developing cartridge 7 is an old product (S17).

  If the output signal of the optical sensor 95 at the time when the warm-up operation is completed is an off signal (S14: NO), it is determined that the developing cartridge 7 is not mounted in the main body casing 2 (S18).

  In addition, various design changes can be made within the scope of matters described in the claims.

DESCRIPTION OF SYMBOLS 1 Laser printer 2 Main body casing 7 Developing cartridge 13 Housing | casing 16 Agitator 17 Agitator rotation axis 18 Developing roller 20 Developing rotation axis 41 First side wall 42 Second side wall 45 Input gear 49 Agitator gear 50 Detected rotating body 51 Input gear rotation shaft 56 Drive output member 62 Agitator rotating shaft 66 Engaging portion 67 Gear teeth 68 Rotating shaft 72 First detected portion 73 Second detected portion 76 Gear teeth 77 Missing tooth portion 78 Engaged portion 73A Tip portion 91 Interference member 95 Optical sensor

Claims (12)

A developing roller that rotates about a first axis;
A supply roller that contacts the developing roller and supplies developer to the developing roller;
An input gear having a coupling portion that receives a driving force from the main body of the image forming apparatus, and a first gear portion that transmits the driving force received by the coupling portion to the supply roller;
An intermediate gear meshing with the first gear portion of the input gear;
An agitator for stirring the internal developer;
An agitator gear fixed to an end of the agitator and meshing with the intermediate gear;
A detectable rotary member to be detected to the detection device provided in the apparatus main body, a developing cartridge having a test known Rotational body rotating about a second axis along the first axis,
The detected rotor is
A cylindrical body,
A first protrusion protruding from the main body in a direction along the second axis;
A second protrusion protruding from the main body in a direction along the second axis, the second protrusion being spaced apart from the first protrusion in the rotation direction of the detected rotating body;
The detected rotor is
A first position for receiving a driving force from the agitator gear;
A second position where the driving force from the agitator gear is interrupted;
The detected rotating body is configured to move from the second position to the first position when the second protrusion comes into contact with a member fixed in the apparatus main body.
Wherein the first projection includes a developing cartridge, characterized in that contact with the front Symbol detection apparatus in the first position is provided inside the apparatus main body. The agitator gear has an engaging portion protruding in a direction in which the first axis extends.
The detected rotating body has an engaged portion in which a rotation trajectory drawn when the detected rotating body rotates partially overlaps a rotation trajectory drawn by the engaging portion;
The engaged portion is
When the detected rotating body is in the second position, it is located outside the rotation locus of the engaging portion,
The developing cartridge according to claim 1, wherein when the detected rotating body is at the first position, the developing cartridge is positioned on a rotation locus of the engaging portion. The agitator gear has a second gear portion;
The detected rotating body has a third gear portion formed in a portion other than the missing tooth portion on the circumferential surface with a part of the circumferential surface as a missing tooth portion,
The developing cartridge according to claim 2 , wherein the chipped portion of the detected rotating body faces the second gear portion when the detected rotating body is in the second position.   The developing cartridge according to claim 3, wherein the engaged portion is disposed at a distance from the third gear portion in a rotation direction of the detected rotating body. The first protrusion and the second protrusion extend in a direction orthogonal to the direction in which the first axis extends,
The part of said 2nd protrusion protrudes in the direction orthogonal to the said 2nd axis line outside the rotation locus | trajectory which the said 1st protrusion draws when the said to-be-detected rotary body rotates. The developing cartridge according to claim 1.   The second protrusion of the detected rotating body is in contact with a member fixed to the apparatus main body in the process of mounting the developing cartridge to the apparatus main body. The developing cartridge according to Item. A holding member in contact with the detected rotating body;
The developing cartridge according to claim 1, wherein the holding member restricts movement of the detected rotating body in a rotation direction at the first position and the second position.   The developing cartridge according to claim 7, wherein the holding member is a wire spring. Has a housing for storing the developer inside,
The housing includes a first side wall and a second side wall that are spaced apart in a direction in which the first axis extends.
The developing cartridge according to claim 7, wherein the detected rotating body and the holding member are supported by the first side wall. The first side wall has a shaft portion extending in a direction in which the first axis extends.
The detected rotating body has a cylindrical cylindrical portion supported by the shaft portion,
The developing cartridge according to claim 9, wherein the holding member is in contact with the cylindrical portion. The agitator gear is a fourth gear portion that meshes with the intermediate gear, and has a fourth gear portion that is located inside the second gear portion in a direction in which the first axis extends.
The diameter of the said 2nd gear part is smaller than the said 4th gear part, and has the said engaging part in the outer edge part in the direction where the said 1st axis is extended, The Claim 3 or 4 characterized by the above-mentioned. Developer cartridge. The engaged portion, the developing cartridge according to any one of claims 2-4, characterized in that protrudes in a direction orthogonal to the second axis extending direction from the body portion.

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